What is the correct sequence to link 3 Airport Express units in a WDS?

I have 3 AE units set up in a WDS. I currently have unit #1 as a main base. Unit #2 is an extended base station. Unit #3 is a remote base station. I have unit #1 connected to the iMac for the internet on the first floor via an ethernet connection. It is linked to units #2 & 3. Unit #2 is about 60' away on the first floor & linked to unit #3 as a relay. Unit #3 is about 18' below unit #2 in the basement and about 75' from unit #1 & connected to the HP notebook via ethernet. The connections between both computers are fine, thought a bit slow. All three AE units have the audio port active to stream iTunes. Most of the time, the audio is great! However, (and this is the problem....finally) when I am at the HP computer & unit #3, the audio signal drops out for booth units #2 & 3 if I turn as certain way in my chair. I guess when I am in a certain place in the basement, I am blocking the signal (weird....). I also noticed this as well sometimes in the stairwell to the basement. All 3 units have the following wireless settings: Multicast Rate = 1...Interference Robustness = disabled...Transmitter Power = 100%. I have tried the Multicast rate @ 2 & 5.5, with the Interference Robustness enabled and disabled. I didn't notice any significant difference. Would it help to take unit #3 out of the direct link of unit #1? (Let unit #1 link to unit #2 and unit #2 link to unit #3.) Any other helpful hints to try would be appreciated. Thanks!!!
iMac   Mac OS X (10.3.9)   Also HP Notebook XP SP2

Would it help to take unit #3 out of the direct link of unit #1? (Let unit #1 link to unit #2 and unit #2 link to unit #3.)
Perhaps but probably not.
The fact remains that RF signals can be blocked and redirected. Therefore physically moving things around can affect wireless performance. For more ideas, see KB 58543, AirPort: Potential sources of interference.

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